Add touch-to-logical coordinate mapping for UI

Implements tapToLogical() to convert normalized touch coordinates to orientation-aware logical screen coordinates. Adds TouchRegistry hit testing for interactive UI elements and header back button. Touch gestures now work correctly across all screen orientations (Portrait, Landscape, etc.) by inverting the rotateCoordinates transform.

src/components/themes/BaseTheme.cpp

@@ -12,6 +12,7 @@
 
 #include "I18n.h"
 #include "RecentBooksStore.h"
+#include "components/TouchRegistry.h"
 #include "components/UITheme.h"
 #include "fontIds.h"
 
@@ -303,6 +304,7 @@ void BaseTheme::drawList(const GfxRenderer& renderer, Rect rect, int itemCount,
   const auto pageStartIndex = selectedIndex / pageItems * pageItems;
   for (int i = pageStartIndex; i < itemCount && i < pageStartIndex + pageItems; i++) {
     const int itemY = rect.y + (i % pageItems) * rowHeight;
+    TouchRegistry::getInstance().add(Rect{rect.x, itemY - 2, rect.width, rowHeight}, i, TouchRegistry::Item);
 
     int rowTextWidth = contentWidth - BaseMetrics::values.contentSidePadding * 2;
     std::string valueText;
@@ -353,6 +355,11 @@ void BaseTheme::drawList(const GfxRenderer& renderer, Rect rect, int itemCount,
 }
 
 void BaseTheme::drawHeader(const GfxRenderer& renderer, Rect rect, const char* title, const char* subtitle) const {
+  // Left strip of the header is a tap-to-go-back zone (orientation-mapped; the
+  // title is centered so this area is normally empty). Mirrors the legacy corner
+  // gesture but as a real, theme-positioned target.
+  TouchRegistry::getInstance().add(Rect{rect.x, rect.y, 64, rect.height + 8}, -1, TouchRegistry::Back);
+
   // Hide last battery draw
   constexpr int maxBatteryWidth = 80;
   renderer.fillRect(rect.x + rect.width - maxBatteryWidth, rect.y + 5, maxBatteryWidth,
@@ -669,6 +676,10 @@ void BaseTheme::drawButtonMenu(GfxRenderer& renderer, Rect rect, int buttonCount
   for (int i = 0; i < buttonCount; ++i) {
     const int tileY = BaseMetrics::values.verticalSpacing + rect.y +
                       static_cast<int>(i) * (BaseMetrics::values.menuRowHeight + BaseMetrics::values.menuSpacing);
+    TouchRegistry::getInstance().add(
+        Rect{rect.x + BaseMetrics::values.contentSidePadding, tileY,
+             rect.width - BaseMetrics::values.contentSidePadding * 2, BaseMetrics::values.menuRowHeight},
+        i, TouchRegistry::Item);
 
     const bool selected = selectedIndex == i;